Noel b



(No Model.)

N. B. GINOGHIO. MAGNETO TELEPHONE.

No. 429,129. Patented June 3, 1890.

ja/mento@ UNITED STATES PATENT OFFICE.

NOEL B. GINOOHIO, OF NEV YORK, N. Y., ASSIGNOR OF ONE-HALF TO ELIAS M.GREENE, OF SAME PLACE.

MAGNETO-TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 429,129, dated J une 3,1890.

Application filed August 6, 1889. Serial No. 319,932. -(No model.)

have invented certain new and useful Im? provements inMagneto-Telephones, of which the following is a specification.

My invention relates to magneto-telephones; and it has for its object toimprove the construction of such instruments,so that they will be moreeffective in operation either in receiving or transmitting messages; andmy invention consists in a telephone constructed and arrangedsubstantially as hereinafter pointed out.

In the accompanying drawings, Figure 1 is a sectional view of atelephone embodying myinvention. Fig. 2 is a similar View showing theuse of a compound core or coil. Fig. 3 is a plan view of a portion ofFig. 2, showing the arrangement of the coils; and Fig. e

y is a sectional view of a modification.

One of the most important features of a magneto-telephone is to producesuch an instrument that will be capable of operating either to send orreceive messages and to produce the best results in the way of loud andfar speaking telephones. Many efforts have heretofore been made toproduce a telephone having these qualities in a large degree, and manyarrangements of parts have been suggested. One of the general featuresof such an instrument consists in producing a strong 'm agnetic fieldbetween the diaphragm and the core of the electro-magnet by which it isoperated or upon which it operates; and the leading feature of mypresent invention consists in an arrangement and construction of partswhereby this is attained to a high degrec.

In the accompanying drawings, A represents a number of permanentmagnets, preferably bent into U shape, and having one of the poles ofeach magnet and that of the same name connected toa common plate, as H.In the figure Ihave shown an instrument having four such magnetsarranged at right angles to each other and secured to this common plate.Upon this plate is formed an annular flange I, into which is fitted thecore G of the electro magnet of the instrument.

This core is made up of iine wires, preferably of soft iron,forming avery intense magnetic pole or extension pole-piece to the permanentmagnets A. This is arranged so that its upper end is directly oppositethe center of the diaphragm B, of magnetic material, and is surroundedby one or more coils connected in the main-line circuit, as hereinafterspecified. The other ends or poles of the permanent magnets areconnected to an iron ring O, upon which the diaphragm B rests, beingclamped thereto by a cap-piece D, of any material, which is made in theform of a tru mpet-mouth, having the. large end clamped on thediaphragm, and on the small end is mounted the usual mouth-piece E.

In order to make the core as powerful as possible, I preferably mountupon the central core G Y-shaped pieces K, the extremities of whichsupport the cores G' G2 G3 of the coils F F2 F3, which coils arepreferably connected in series in the line. These Y-shaped pieces, beingin intimate contact with the main core G, concentrate the magnetism inthe cores G G2 G3 in the extremity of the main core G,

so that the pole P is in a highly-magnetic condition. The diaphragm B isalso connected to the opposite poles of all the permanent magnets, sothat the magnetic power of all of them is concentrated in the diaphragmat a point opposite the main core. In this way I am able to produce avery strong magnetic field between the center of the diaphragm and themain core, and it is evident that any vibration or movement of thediaphragm in this field will produce greatly-increased magnetic changesin the core, and hence in the coils surrounding the core connected inthe line. On the contrary, varying currents fiowing through the coilswill change the magnetic condition of the core, and these in turn willoperate upon the diaphragm in the strong magnetic field and produceintensified effects.

In Fig. 4 the construction varies in det-ail in the plate H, which isconnected to the common poles of the magnets, supports a soft-i ronpolepiece R, and the core G, of fine wires, is fitted in the end of thepole-piece R. A box S, of some resonant material, is shown assurrounding the core' and helix, and is held in- IOO place by beingscrewed into the inner edge of the ring C. XVith this arrangement ofparts I have found that I can use a very strong current in the coils,and the intense magnetic iield enables me to produce intensified effectsin the variations transmitted to the line, so that the instruments canbe used for greater distances and produce louder eiiects than is common.It is evident that these eiieets can be increased or diminished Withincertain limits by increasing or diminishing the number and strength ofthe permanent magnets; and While I have indicated four as being a propernumberI do not confine my invention to this specific construction. Thesame may be said in regard to the number of coils and cores forming thecompound electro-magnet. l have adopted three in the present instance,as they can be compactly arranged in a small instrument, and I find theyproduce satisfactory results; but more magnets can be arranged andconnected together, so as to have a common pole-picee opposite thecenter ot the diaphragm, substantially as indicated, Without departingfrom the spirit of my in- Vention.

XVhat I claim is- 1. In a magneto-telephone, the combi nation,

with the permanent magnets, of a plate connecting all the poles of onename, a lia-nge on said plate, a core of fine wires supported in saidiiango, a ring of magnetic material connecting the poles of the oppositename, and a diaphragm supported on said ring, substantially asdescribed.

2. In a magneto-telephone, the compound electro-1nagnet consisting of acentral core, yoke-pieces connected to said core and4 supporting theindependent cores, and helices surrounding said independent cores, theconnected poles being all of the same polarity, substantially asdescribed.

3. In a magnetotelephone, the combination of a plurality of permanentmagnets, a softiron core common to all the magnets, yokepieces connectedto said core and supporting independent cores, and helices connected inseries in the line surrounding said independent cores, substantially asdescribed.

In testimony whereofl have si gncd m yname to this speciiication in thepresence of two subscribing witnesses.

NOEL ll. GINOCIIIO.

IVitncsscs:

JOHN C. FRANCIS, W. J. IIAWTnoRN.

